stumped in ok
 

05 F350 powerstroke really rough idol only when cold and the colder it is the worse it gets same with smoke only when cold . no codes or check engine light new filters and #8 injector my mechanic said all the others were fine and he didnt know why it was so rough on cold starts. when it gets warm it runs great any help would be great.

my guess would be glowplugs

any Ford gurus here please

Have you had a FICM calibration update, (Fuel Injector Control Module), this correct's most of these symptom's. :U:

FICM needs updating, or replacing. What is the PID FICM_LPWR, FICM_MPWR reading during KOEO and cranking?

Do the injectors "Rattle" when you turn the key on before you start hte truck?

take to ford dealer and have them check out the cylinders that are misfiring on start up shouldnt cost you much, also updating the ficm is a band aid for the misfire on cold start

Kind of. If the FICM's wasted, it won't make the necessary 1.21 gigawatts required to ...wait...what?

If it won't make 48V, it won't rattle the injectors properly before startup to help alleviate stiction, or fire them properly during engine running.

The inductive heating flash (if your injectors 'rattle') KILLS FICM's.

We are seeing them drop like flies now that it's starting to get warm out.

have seen a lot of ficms dropping around here also, then again everything seems to fail on a 6.0